Method for producing ABS compounds with improved surface after hot-wet storage

摘要

Preparing a composition comprises: (a) treating a salt containing component comprising (B1) at least one graft polymer, and (B4) at least one inorganic salt with water, (b) melting and kneading the treated component, (c) optionally mixing the component with (A) a thermoplastic polymer other than (B), and (C) at least one polymer additive and melting and kneading the mixture, and (d) dispersing the components of the mixture. Preparing a composition comprises: (a) treating a salt containing component comprising (B) 2-100 pts. wt. of (B1) at least one graft polymer prepared by an emulsion polymerization process, (B2) optionally at least one graft polymer prepared by a mass, suspension and/or solution polymerization process, and (B3) optionally at least one rubber-free vinyl (co)polymer, and (B4) at least one inorganic salt comprising a cation comprising alkali metals, alkaline earth metals or aluminum and an anion comprising chloride, sulfate, nitrate, phosphate, acetate or formate, in a concentration of 100-5000 mg/kg, with water by contacting the component with liquid water and/or with water-vapor-containing atmosphere, (b) melting and kneading the component that has been treated with water, (c) optionally mixing the component with (A) 0-98 pts. wt. of a thermoplastic polymer or a mixture of thermoplastic polymers other than (B), and (C) 0-30 pts. wt. of at least one polymer additive and melting and kneading the mixture, and (d) dispersing the components of the mixture, where at least one of the steps (b) or (c) is applied at a low pressure of at least 200 mbar, and the water is removed. An independent claim is included for a molded body and/or molding produced from a polymer composition prepared by the above process, comprising a class A surface and a partial or full high-gloss finish, where the gloss level in high-gloss regions is at least 95, determined in reflection according to DIN 67530 at a measuring angle of 60[deg] , which can optionally be subjected partially or completely to a further surface treatment step optionally by painting, in-mold decoration, metallization by vacuum deposition and/or galvanization.